Epic Quest Bio The case files
Case No. 133 · the exotic forty · have you seen this molecule?

Seaborgium hexacarbonyl

the heaviest element ever bonded to carbon

File sealed

The detectives are still writing this one up. The poster and the facts are below; the film and the interrogation room open soon.

Booking photographs

Seaborgium hexacarbonyl, front view, against a height chart in nanometers
FRONT
Seaborgium hexacarbonyl, side view
SIDE · Model

The suspect, from its real atomic coordinates. Drag to turn it. Height chart in nanometers, ruled every 0.05 nm. Mugshot: a computer model. A dime is about twenty-seven million times wider.

Rap sheet

Answers to
Sg(CO)6. Seaborgium carbonyl, to friends.
Height
0.65 nm, tip to tip.
Weight
0.71 zeptograms; 0.72 with six more neutrons.
Build
An octahedron: one seaborgium, six CO.
Status
Zero-valent. The only time seaborgium has been caught below +6.
Lifespan
Half gone in under half a second, when the seaborgium inside decays.
Weakness
Relativity. Its bonds are weaker than tungsten’s, against the trend.
Associates
The molybdenum and tungsten hexacarbonyls. Copies them on silica.
Last seen
Sticking to a chilled gold detector, in a lab in Darmstadt.
3

of them caught in two weeks of firing 4,000,000,000,000,000,000 chromium ions at lead.
You’ve never seen one.

CASE FILE: Yakushev, A. et al. (2026) Observation of relativistic bond weakening in seaborgium hexacarbonyl. Nature 658, 337–341.

The poster on the street

The wanted poster for Seaborgium hexacarbonyl

This is the photocopied wanted poster for Seaborgium hexacarbonyl, No. 133 of the exotic forty. They were made for noticeboards around Boston, Cambridge and the rest of the east coast.

Found one? Scan its QR code with your phone. If you're a signed-in player, the sighting goes on your record with +1 XP.

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